US6147723A - Display device with multilayer film between LCD and backlight - Google Patents
Display device with multilayer film between LCD and backlightDownload PDFInfo
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- US6147723A US6147723AUS08/609,213US60921396AUS6147723AUS 6147723 AUS6147723 AUS 6147723AUS 60921396 AUS60921396 AUS 60921396AUS 6147723 AUS6147723 AUS 6147723A
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- light source
- light
- layer film
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0058—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide
- G02B6/0061—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide to provide homogeneous light output intensity
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133605—Direct backlight including specially adapted reflectors
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133611—Direct backlight including means for improving the brightness uniformity
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F13/00—Illuminated signs; Luminous advertising
- G09F13/20—Illuminated signs; Luminous advertising with luminescent surfaces or parts
- G09F13/22—Illuminated signs; Luminous advertising with luminescent surfaces or parts electroluminescent
Definitions
- This inventionrelates to a display device and an information processing apparatus having the display device, and particularly to a display device having a liquid crystal light valve, and an information processing apparatus employing the display device having the liquid crystal light valve, such as a projection type TV set, a direct view type TV set, a word processor or a computer.
- the display device of such information processing apparatusilluminates a liquid crystal light valve (panel) from the back thereof by a planar fluorescent lamp.
- a planar fluorescent lamp 1has a light emission distribution 2 similar to the distribution of diffused light emitted by a complete diffusion surface, and the light from the fluorescent lamp 1 has a large angle of emission and includes many rays of light having a large angle of incidence onto a liquid crystal light valve.
- the modulating performance of the liquid crystal light valvedeteriorates as the angle of incidence of the incident ray of light becomes larger and therefore, when the fluorescent lamp 1 is used, there are created rays of light which are not properly modulated by the liquid crystal light valve, thereby causing a deterioration in the quality of the image produced by the liquid crystal light valve.
- the display device and information processing apparatus of the present inventioncomprise a liquid crystal light valve and illuminating means for illuminating the liquid crystal light valve, the illuminating means having a light emitting plate of a large angle of emission and a multi-layer film for selectively reflecting some part of the light from the plate to reduce the angle of emission and cause the light to enter the light valve.
- the display device and information processing apparatus of the present inventioncomprise a liquid crystal light valve and illuminating means for illuminating the liquid crystal light valve, the illuminating means having a light emitting plate of a large angle of emission, and a substrate facing the plate with an air layer interposed therebetween having a multi-layer film for selectively reflecting some part of the light from the plate to reduce the angle of emission and cause the light to enter the light valve.
- the display device and information processing apparatus of the present inventioncomprise a liquid crystal light valve and illuminating means for illuminating the liquid crystal light valve, the illuminating means having a fluorescent plate responsive to radiation energy to emit visible light of a large angle of emission, a multi-layer film for selectively reflecting some part of the light from the fluorescent plate to reduce the angle of emission and cause the light to enter the light valve, and an another film such as a dichroic film provided on a side of the fluorescent plate which is opposite to the multi-layer film so as to transmit the radiation energy therethrough and reflect the visible light.
- the illuminating meanshaving a fluorescent plate responsive to radiation energy to emit visible light of a large angle of emission, a multi-layer film for selectively reflecting some part of the light from the fluorescent plate to reduce the angle of emission and cause the light to enter the light valve, and an another film such as a dichroic film provided on a side of the fluorescent plate which is opposite to the multi-layer film so as to transmit the radiation energy therethrough and reflect the visible light.
- FIG. 1is an illustration showing an embodiment of the present invention.
- FIG. 2is a schematic view showing another embodiment of the present invention.
- FIG. 3is a schematic view showing still another embodiment of the present invention.
- FIG. 4is a schematic view showing yet still another embodiment of the present invention.
- FIG. 5is a schematic view showing a further embodiment of the present invention.
- FIG. 6is an illustration showing still a further embodiment of the present invention.
- FIG. 7is a schematic view showing yet still a further embodiment of the present invention.
- FIG. 8is a schematic view showing a further embodiment of the present invention.
- FIG. 9is a schematic diagram showing an example of the display device of the present invention.
- FIGS. 10A, 10B and 10Care schematic views showing some applications of the display device of the present invention, FIG. 10A showing a compact TV set, FIG. 10B showing a word processor, and FIG. 10C showing a projection type TV set.
- FIG. 11is an illustration of the conventional display device.
- numeral 1designates a planar fluorescent lamp.
- the reference numeral 9denotes a plane parallel substrate formed of glass or plastic almost transparent to light from the fluorescent lamp 1.
- the surface of the substrate 9 and the light emitting surface of the fluorescent lamp 1are parallel to each other, and the two are disposed proximately to each other with an air layer of e.g. 1 mm interposed therebetween.
- Numeral 10designates multi-layer film (reflecting mirror) formed on that surface of the substrate 9 which is opposite to the fluorescent lamp 1.
- This multi-layer film 10is constructed such that by suitably determining the refractive indices of alternate layers forming the multi-layer film, a ray of light 5 within the range of an angle ⁇ is transmitted therethrough and a ray of light 6 outside the range of the angle ⁇ (of which the angle of incidence exceeds ⁇ /2) is totally reflected by the interface between the alternate layers.
- This light source devicecan obtain only the flux of the ray of light 5 within the range of the angle ⁇ as an illuminating light flux due to the effect of the multi-layer film 10 and moreover, the ray of light 6 reflected by the multi-layer film 10 is scattered by the fluorescent lamp 1 and again enters the substrate 9 from the fluorescent lamp 1, and some of it is obtained as the ray of light 5 and therefore, the amount of loss of the light becomes small.
- FIG. 2is a schematic view showing another embodiment of the light source device of the present invention, and in FIG. 2, the same members as those in the device of FIG. 1 are given the same reference numerals and need not be described.
- the difference of this light source device from the device of FIG. 1is that multi-layer film 11 is formed also on that surface of the substrate 9 which is adjacent to the fluorescent lamp 1, and this light source device also achieves an effect similar to that of the device of FIG. 1.
- FIG. 3is a schematic view showing still another embodiment of the light source device of the present invention, and in FIG. 3, the same members as those in the device of FIG. 1 are given the same numerals and need not be described.
- the difference of this light source device from the device of FIG. 1is that the fluorescent lamp 1 and the substrate 9 are joined together by an adhesive agent 7.
- This light source devicealso achieves an effect similar to that of the device of FIG. 1.
- FIG. 4is a schematic view showing yet still another embodiment of the light source device of the present invention, and this embodiment is one which uses a wave guide plate type planar light source instead of the planar fluorescent lamp 1.
- numeral 9designates a glass substrate and numeral 10 denotes multi-layer film, and these have the same functions as those of the aforedescribed embodiments.
- Numeral 21designates a light directing portion formed of glass or plastic
- numeral 22denotes a light scattering portion provided by roughening a front surface of the glass
- numeral 23designates a mirror portion comprising metallic reflecting film formed on a back surface of the glass
- numeral 24denotes a lamp
- numeral 25designates a back mirror of a spherical surface or a parabolic surface provided on the back of the lamp 24.
- the light from the lamp 24 and back mirror 25propagates through the glass 21 while being reflected and is scattered by the light scattering portion 22 on the surface of the glass 21 and illuminates the glass substrate 9 having the multi-layer film 10.
- FIG. 5is a schematic view showing a further embodiment of the light source device of the present invention.
- Reflecting film 26is formed on the upper, lower, left and right portions (side surfaces) of the glass substrate 9 of the device of FIG. 1 to thereby prevent the light from leaking from the four portions of the glass substrate 9.
- the functions of the glass substrate 9 and multi-layer film 10are the same as those of the aforedescribed embodiments.
- FIG. 6is an illustration showing still a further embodiment of the light source device of the present invention, and represents the distribution of the multi-layer film on the surface of the glass substrate 9 of the device of FIG. 1.
- the intensity of a plate type light sourceis usually reduced from the center to the periphery thereof and therefore, as shown in FIG. 6, on the surface of the glass substrate 9, different multi-layer films are formed as circular or zonal shapes A o -A n from the center to the periphery, and the transmittances of the respective multi-layer films are gradually reduced from the periphery to the center, whereby the luminance distribution of the light after having emerged from the multi-layer films 10 may become uniform.
- FIGS. 7 and 8are schematic views showing further embodiments of the light source device of the present invention, and in these embodiments, the glass substrate 9 and multi-layer film 10 have the same functions as those of the aforedescribed embodiments.
- the fluorescent lamp 1creates ultraviolet light within the tube thereof, and this ultraviolet light is applied to the fluorescent surface thereof to fluoresce, thereby creating visible light.
- a ray of light of a large angle of emergence reflected by the multi-layer film 10 on the glass substrate 9 of the device of FIG. 1enters the fluorescent surface of the fluorescent lamp 1, and some of it reaches the interior of the tube and does not return to the glass substrate 9 side. So, in these two embodiments, as shown in FIGS.
- dichroic film transmitting ultraviolet rays therethrough and reflecting visible lightis provided between the fluorescent surface 27 and fluorescent tube (glass tube) 29 of the fluorescent lamp 1, and the light reflected by the multi-layer film 10 is mostly caused to re-enter the glass substrate 9 without being caused to enter into the tube 29.
- the embodiment of FIG. 7is one in which the fluorescent lamp 1 and the glass substrate 9 are in intimate contact with each other, and the fluorescent lamp 1 has dichroic film formed on the tube 29, and fluorescent paint is applied on this film.
- the embodiment of FIG. 8is such that fluorescent paint is applied to the surface of the glass substrate 9 to provide the fluorescent surface 27 and dichroic film is formed on the surface of the tube 29 of the fluorescent lamp 1.
- numeral 20designates a clearance.
- FIG. 9is an illustration showing an example of the display device of the present invention, and in FIG. 9, the same members as those in the device of FIG. 1 are given the same reference numerals and need not be described.
- numeral 12denotes a liquid crystal panel which may be any of various commercially available liquid crystal display panels.
- Numeral 13designates a driving circuit for the liquid crystal panel, and
- numeral 14denotes a driving circuit for the planar fluorescent lamp 1.
- Numeral 100designates the display device. As can be understood from the description of FIG. 1, according to this display device 100, most of the light emitted from the fluorescent lamp 1 can be turned within a limited range of angle, and light within a range of angle (e.g. ⁇ 20°) suited for the incidence angle characteristic of the light modulating effect of the liquid crystal panel is caused to enter the liquid crystal panel. Accordingly, images which are very bright and easy to see can be displayed.
- a range of anglee.g. ⁇ 20°
- the display device of the present inventionis not restricted to the form shown in FIG. 9. That is, it also includes forms in which the light source devices of FIGS. 1 to 8 are applied as the light source portions of conventional various liquid crystal display devices.
- FIGS. 10A, 10B and 10Care schematic views showing some applications of the above-described display device 100 as shown in FIG. 9, FIG. 10A showing a compact TV set provided with the display device 100 and an operating portion 30, FIG. 10B showing a word processor provided with the display device 100 and a keyboard 40, and FIG. 10C showing a projection type TV set provided with the display device 100 and a projection lens system 50.
- the display device of the present inventionis also applicable to personal computers, computer systems, control systems, etc., besides the business machines shown in FIGS. 10A to 10C.
- the light from the planar light emitting bodycan be turned within a predetermined range of angle, and the light from the planar light emitting body can be efficiently caused to enter the liquid crystal panel to thereby enable a bright display to be accomplished.
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- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
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Abstract
Description
This application is a continuation of application Ser. No. 08/165,412, filed Dec. 13, 1993, now abandoned.
1. Field of the Invention
This invention relates to a display device and an information processing apparatus having the display device, and particularly to a display device having a liquid crystal light valve, and an information processing apparatus employing the display device having the liquid crystal light valve, such as a projection type TV set, a direct view type TV set, a word processor or a computer.
2. Related Background Art
Recently, the display device of such information processing apparatus illuminates a liquid crystal light valve (panel) from the back thereof by a planar fluorescent lamp.
However, as shown in FIG. 11 of the accompanying drawings, a planar fluorescent lamp 1 has alight emission distribution 2 similar to the distribution of diffused light emitted by a complete diffusion surface, and the light from the fluorescent lamp 1 has a large angle of emission and includes many rays of light having a large angle of incidence onto a liquid crystal light valve. The modulating performance of the liquid crystal light valve deteriorates as the angle of incidence of the incident ray of light becomes larger and therefore, when the fluorescent lamp 1 is used, there are created rays of light which are not properly modulated by the liquid crystal light valve, thereby causing a deterioration in the quality of the image produced by the liquid crystal light valve.
It is the object of the present invention to provide a display device for displaying high quality images and an information processing apparatus provided with such display device.
The display device and information processing apparatus of the present invention comprise a liquid crystal light valve and illuminating means for illuminating the liquid crystal light valve, the illuminating means having a light emitting plate of a large angle of emission and a multi-layer film for selectively reflecting some part of the light from the plate to reduce the angle of emission and cause the light to enter the light valve.
In a preferred form, the display device and information processing apparatus of the present invention comprise a liquid crystal light valve and illuminating means for illuminating the liquid crystal light valve, the illuminating means having a light emitting plate of a large angle of emission, and a substrate facing the plate with an air layer interposed therebetween having a multi-layer film for selectively reflecting some part of the light from the plate to reduce the angle of emission and cause the light to enter the light valve.
In another preferred form, the display device and information processing apparatus of the present invention comprise a liquid crystal light valve and illuminating means for illuminating the liquid crystal light valve, the illuminating means having a fluorescent plate responsive to radiation energy to emit visible light of a large angle of emission, a multi-layer film for selectively reflecting some part of the light from the fluorescent plate to reduce the angle of emission and cause the light to enter the light valve, and an another film such as a dichroic film provided on a side of the fluorescent plate which is opposite to the multi-layer film so as to transmit the radiation energy therethrough and reflect the visible light.
FIG. 1 is an illustration showing an embodiment of the present invention.
FIG. 2 is a schematic view showing another embodiment of the present invention.
FIG. 3 is a schematic view showing still another embodiment of the present invention.
FIG. 4 is a schematic view showing yet still another embodiment of the present invention.
FIG. 5 is a schematic view showing a further embodiment of the present invention.
FIG. 6 is an illustration showing still a further embodiment of the present invention.
FIG. 7 is a schematic view showing yet still a further embodiment of the present invention.
FIG. 8 is a schematic view showing a further embodiment of the present invention.
FIG. 9 is a schematic diagram showing an example of the display device of the present invention.
FIGS. 10A, 10B and 10C are schematic views showing some applications of the display device of the present invention, FIG. 10A showing a compact TV set, FIG. 10B showing a word processor, and FIG. 10C showing a projection type TV set.
FIG. 11 is an illustration of the conventional display device.
Referring to FIG. 1 which is an illustration showing an embodiment of the light source device of the present invention, numeral 1 designates a planar fluorescent lamp. Thereference numeral 9 denotes a plane parallel substrate formed of glass or plastic almost transparent to light from the fluorescent lamp 1. The surface of thesubstrate 9 and the light emitting surface of the fluorescent lamp 1 are parallel to each other, and the two are disposed proximately to each other with an air layer of e.g. 1 mm interposed therebetween. Numeral 10 designates multi-layer film (reflecting mirror) formed on that surface of thesubstrate 9 which is opposite to the fluorescent lamp 1. Thismulti-layer film 10 is constructed such that by suitably determining the refractive indices of alternate layers forming the multi-layer film, a ray oflight 5 within the range of an angle θ is transmitted therethrough and a ray oflight 6 outside the range of the angle θ (of which the angle of incidence exceeds θ/2) is totally reflected by the interface between the alternate layers.
This light source device can obtain only the flux of the ray oflight 5 within the range of the angle θ as an illuminating light flux due to the effect of themulti-layer film 10 and moreover, the ray oflight 6 reflected by themulti-layer film 10 is scattered by the fluorescent lamp 1 and again enters thesubstrate 9 from the fluorescent lamp 1, and some of it is obtained as the ray oflight 5 and therefore, the amount of loss of the light becomes small.
FIG. 2 is a schematic view showing another embodiment of the light source device of the present invention, and in FIG. 2, the same members as those in the device of FIG. 1 are given the same reference numerals and need not be described. The difference of this light source device from the device of FIG. 1 is thatmulti-layer film 11 is formed also on that surface of thesubstrate 9 which is adjacent to the fluorescent lamp 1, and this light source device also achieves an effect similar to that of the device of FIG. 1.
As a modification of the light source devices of FIGS. 1 and 2, there is a form in which a multi-layer film reflecting mirror is formed only on that surface of thesubstrate 9 which is adjacent to the fluorescent lamp 1.
FIG. 3 is a schematic view showing still another embodiment of the light source device of the present invention, and in FIG. 3, the same members as those in the device of FIG. 1 are given the same numerals and need not be described. The difference of this light source device from the device of FIG. 1 is that the fluorescent lamp 1 and thesubstrate 9 are joined together by anadhesive agent 7. This light source device also achieves an effect similar to that of the device of FIG. 1.
FIG. 4 is a schematic view showing yet still another embodiment of the light source device of the present invention, and this embodiment is one which uses a wave guide plate type planar light source instead of the planar fluorescent lamp 1. In FIG. 4,numeral 9 designates a glass substrate andnumeral 10 denotes multi-layer film, and these have the same functions as those of the aforedescribed embodiments. Numeral 21 designates a light directing portion formed of glass or plastic,numeral 22 denotes a light scattering portion provided by roughening a front surface of theglass 21,numeral 23 designates a mirror portion comprising metallic reflecting film formed on a back surface of theglass 21,numeral 24 denotes a lamp, andnumeral 25 designates a back mirror of a spherical surface or a parabolic surface provided on the back of thelamp 24. The light from thelamp 24 andback mirror 25 propagates through theglass 21 while being reflected and is scattered by thelight scattering portion 22 on the surface of theglass 21 and illuminates theglass substrate 9 having themulti-layer film 10.
FIG. 5 is a schematic view showing a further embodiment of the light source device of the present invention. Reflectingfilm 26 is formed on the upper, lower, left and right portions (side surfaces) of theglass substrate 9 of the device of FIG. 1 to thereby prevent the light from leaking from the four portions of theglass substrate 9. The functions of theglass substrate 9 andmulti-layer film 10 are the same as those of the aforedescribed embodiments.
FIG. 6 is an illustration showing still a further embodiment of the light source device of the present invention, and represents the distribution of the multi-layer film on the surface of theglass substrate 9 of the device of FIG. 1. The intensity of a plate type light source is usually reduced from the center to the periphery thereof and therefore, as shown in FIG. 6, on the surface of theglass substrate 9, different multi-layer films are formed as circular or zonal shapes Ao -An from the center to the periphery, and the transmittances of the respective multi-layer films are gradually reduced from the periphery to the center, whereby the luminance distribution of the light after having emerged from themulti-layer films 10 may become uniform.
FIGS. 7 and 8 are schematic views showing further embodiments of the light source device of the present invention, and in these embodiments, theglass substrate 9 andmulti-layer film 10 have the same functions as those of the aforedescribed embodiments. The fluorescent lamp 1 creates ultraviolet light within the tube thereof, and this ultraviolet light is applied to the fluorescent surface thereof to fluoresce, thereby creating visible light. A ray of light of a large angle of emergence reflected by themulti-layer film 10 on theglass substrate 9 of the device of FIG. 1 enters the fluorescent surface of the fluorescent lamp 1, and some of it reaches the interior of the tube and does not return to theglass substrate 9 side. So, in these two embodiments, as shown in FIGS. 7 and 8, dichroic film transmitting ultraviolet rays therethrough and reflecting visible light is provided between thefluorescent surface 27 and fluorescent tube (glass tube) 29 of the fluorescent lamp 1, and the light reflected by themulti-layer film 10 is mostly caused to re-enter theglass substrate 9 without being caused to enter into thetube 29. The embodiment of FIG. 7 is one in which the fluorescent lamp 1 and theglass substrate 9 are in intimate contact with each other, and the fluorescent lamp 1 has dichroic film formed on thetube 29, and fluorescent paint is applied on this film. The embodiment of FIG. 8 is such that fluorescent paint is applied to the surface of theglass substrate 9 to provide thefluorescent surface 27 and dichroic film is formed on the surface of thetube 29 of the fluorescent lamp 1. In FIG. 8, numeral 20 designates a clearance.
FIG. 9 is an illustration showing an example of the display device of the present invention, and in FIG. 9, the same members as those in the device of FIG. 1 are given the same reference numerals and need not be described. In FIG. 9,numeral 12 denotes a liquid crystal panel which may be any of various commercially available liquid crystal display panels. Numeral 13 designates a driving circuit for the liquid crystal panel, and numeral 14 denotes a driving circuit for the planar fluorescent lamp 1. Numeral 100 designates the display device. As can be understood from the description of FIG. 1, according to thisdisplay device 100, most of the light emitted from the fluorescent lamp 1 can be turned within a limited range of angle, and light within a range of angle (e.g. θ≡20°) suited for the incidence angle characteristic of the light modulating effect of the liquid crystal panel is caused to enter the liquid crystal panel. Accordingly, images which are very bright and easy to see can be displayed.
The display device of the present invention is not restricted to the form shown in FIG. 9. That is, it also includes forms in which the light source devices of FIGS. 1 to 8 are applied as the light source portions of conventional various liquid crystal display devices.
FIGS. 10A, 10B and 10C are schematic views showing some applications of the above-describeddisplay device 100 as shown in FIG. 9, FIG. 10A showing a compact TV set provided with thedisplay device 100 and an operatingportion 30, FIG. 10B showing a word processor provided with thedisplay device 100 and akeyboard 40, and FIG. 10C showing a projection type TV set provided with thedisplay device 100 and aprojection lens system 50.
The display device of the present invention is also applicable to personal computers, computer systems, control systems, etc., besides the business machines shown in FIGS. 10A to 10C.
According to the present invention, the light from the planar light emitting body can be turned within a predetermined range of angle, and the light from the planar light emitting body can be efficiently caused to enter the liquid crystal panel to thereby enable a bright display to be accomplished.
Claims (12)
1. A display device comprising:
a liquid crystal light valve; and
illuminating means for illuminating said liquid crystal light valve, said illuminating means having a wave guide plate type planar light source and a substrate facing said light source with an air layer interposed therebetween and having a multi-layer film for selectively reflecting some part of the light from said wave guide plate type planar light source without effecting color-filtering so as to make divergence of the light from said light source small, with
said multi-layer film being divided into a plurality of regions having different transmittance from one another, said plurality of regions being so distributed as to uniformize an intensity distribution of the light from said light source.
2. An information processing apparatus comprising:
a liquid crystal light valve; and
illuminating means for illuminating said liquid crystal light valve, said illuminating means having a wave guide plate type planar light source and a substrate facing said light source with an air layer interposed therebetween and having a multi-layer film for selectively reflecting some part of the light from said wave guide plate type planar light source without effecting color-filtering so as to make divergence of the light from said light source small, with
said multi-layer film being divided into a plurality of regions having different transmittance from one another, said plurality of regions being so distributed as to uniformize an intensity distribution of the light from said light source.
3. A display device comprising:
a liquid crystal light valve; and
illuminating means for illuminating said liquid crystal light valve, said illuminating means having a wave guide plate type planar light source and a substrate facing said light source and having a multi-layer film for selectively reflecting some part of the light from said wave guide plate type planar light source without effecting color-filtering so as to make divergence of the light from said light source small, with
said multi-layer film being divided into a plurality of regions having different transmittance from one another, said plurality of regions being so distributed as to uniformize an intensity distribution of the light from said light source.
4. An information processing apparatus comprising:
a liquid crystal light valve; and
illuminating means for illuminating said liquid crystal light valve, said illuminating means having a wave guide plate type planar light source and a substrate facing said light source and having a multi-layer film for selectively reflecting some part of the light from said wave guide plate type planar light source without effecting color-filtering so as to make divergence of the light from said light source small, with
said multi-layer film being divided into a plurality of regions having different transmittance from one another, said plurality of regions being so distributed as to uniformize an intensity distribution of the light from said light source.
5. A display device comprising:
a liquid crystal light valve; and
illuminating means for illuminating said liquid crystal light valve, said illuminating means having a wave guide plate type planar light source and a substrate facing said light source and having a multi-layer film for selectively reflecting some part of the light from said wave guide plate type planar light source without effecting color-filtering so as to make divergence of the light from said light source small, and wherein said light source includes a transparent plate having a scattering surface on a front surface, a reflection surface on a rear surface, and a lamp, with
said multi-layer film being divided into a plurality of regions having different transmittance from one another, said plurality of regions being so distributed as to uniformize an intensity distribution of the light from said light source.
6. An information processing apparatus comprising:
a liquid crystal light valve; and
illuminating means for illuminating said liquid crystal light valve, said illuminating means having a wave guide plate type planar light source and a substrate facing said light source and having a multi-layer film for selectively reflecting some part of the light from said wave guide plate type planar light source without effecting color-filtering so as to make divergence of the light from said light source small, and wherein said light source includes a transparent plate having a scattering surface on a front surface, a reflection surface on a rear surface, and a lamp, with
said multi-layer film being divided into a plurality of regions having different transmittance from one another, said plurality of regions being so distributed as to uniformize an intensity distribution of the light from said light source.
7. A display device comprising:
a liquid crystal light valve; and
an illuminating device for illuminating said liquid crystal light valve, said illuminating device having a wave guide plate type planar light source and a substrate facing said light source and having a multi-layer film for selectively reflecting some part of the light from said wave guide plate type planar light source so as to make divergence of the light from said light source small, with
said multi-layer film being divided into a plurality of regions having different transmittance from one another, said plurality of regions being so distributed as to uniformize an intensity distribution of the light from said light source.
8. An information processing apparatus comprising:
a liquid crystal light valve; and
an illuminating device for illuminating said liquid crystal light valve, said illuminating device having a wave guide plate type planar light source and a substrate facing said light source and having a multi-layer film for selectively reflecting some part of the light from said wave guide plate type planar light source so as to make divergence of the light from said light source small, with
said multi-layer film being divided into a plurality of regions having different transmittance from one another, said plurality of regions being so distributed as to uniformize an intensity distribution of the light from said light source.
9. An illuminating device comprising:
a wave guide plate type planar light source; and
a substrate facing said light source and having a multi-layer film for selectively reflecting some part of the light from said wave guide plate type planar light source without effecting color-filtering so as to make divergence of the light from said light source small, with
said multi-layer film being divided into a plurality of regions having different transmittance from one another, said plurality of regions being so distributed as to uniformize an intensity distribution of the light from said light source.
10. A display device comprising:
a liquid crystal light valve; and
an illuminating device for illuminating said liquid crystal light valve, said illuminating device having a light source and a substrate facing said light source and having a multi-layer film for selectively reflecting some part of the light from said light source so as to make divergence of the light from said light source small, said multi-layer being divided into a plurality of regions having different transmittance from one another, said plurality of regions being so distributed as to uniformize an intensity distribution of the light from said light source.
11. An information processing apparatus comprising:
a liquid crystal light valve; and
an illuminating device for illuminating said liquid crystal light valve, said illuminating device having a light source and a substrate facing said light source and having a multi-layer film for selectively reflecting some part of the light from said light source so as to make divergence of the light from said light source small, said multi-layer film being divided into a plurality of regions having different transmittance from one another, said plurality of regions being so distributed as to uniformize an intensity distribution of the light from said light source.
12. An illuminating device comprising:
a light source;
a substrate facing said light source and having a multi-layer film for selectively reflecting some part of the light from said light source so as to make divergence of the light from said light source small, said multi-layer film being divided into a plurality of regions having different transmittance from one another, said plurality of regions being so distributed as to uniformize an intensity distribution of the light from said light source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/609,213US6147723A (en) | 1992-12-22 | 1996-03-01 | Display device with multilayer film between LCD and backlight |
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34250492 | 1992-12-22 | ||
| JP4-342504 | 1992-12-22 | ||
| JP5014859AJPH06242441A (en) | 1992-12-22 | 1993-02-01 | Light source device and display device equipped with the same |
| JP5-014859 | 1993-02-01 | ||
| US16541293A | 1993-12-13 | 1993-12-13 | |
| US08/609,213US6147723A (en) | 1992-12-22 | 1996-03-01 | Display device with multilayer film between LCD and backlight |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US16541293AContinuation | 1992-12-22 | 1993-12-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US6147723Atrue US6147723A (en) | 2000-11-14 |
Family
ID=26350886
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US08/609,213Expired - Fee RelatedUS6147723A (en) | 1992-12-22 | 1996-03-01 | Display device with multilayer film between LCD and backlight |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US6147723A (en) |
| JP (1) | JPH06242441A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020130786A1 (en)* | 2001-01-16 | 2002-09-19 | Visteon Global Technologies,Inc. | Series led backlight control circuit |
| US6697130B2 (en) | 2001-01-16 | 2004-02-24 | Visteon Global Technologies, Inc. | Flexible led backlighting circuit |
| US6717559B2 (en) | 2001-01-16 | 2004-04-06 | Visteon Global Technologies, Inc. | Temperature compensated parallel LED drive circuit |
| US6930737B2 (en) | 2001-01-16 | 2005-08-16 | Visteon Global Technologies, Inc. | LED backlighting system |
| US20080064131A1 (en)* | 2006-09-12 | 2008-03-13 | Mutual-Tek Industries Co., Ltd. | Light emitting apparatus and method for the same |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20080021059A (en)* | 2005-05-27 | 2008-03-06 | 코닌클리즈케 필립스 일렉트로닉스 엔.브이. | Lighting device |
| JP4622935B2 (en)* | 2006-06-01 | 2011-02-02 | ソニー株式会社 | Surface light source device |
| JP2008036287A (en)* | 2006-08-09 | 2008-02-21 | Olympus Medical Systems Corp | Capsule endoscope |
| JP2008277097A (en)* | 2007-04-27 | 2008-11-13 | Matsushita Electric Ind Co Ltd | Cooker |
Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3736047A (en)* | 1971-08-13 | 1973-05-29 | Optical Coating Laboratory Inc | Liquid crystal display device with internal anti-reflection casting |
| US4704004A (en)* | 1986-01-02 | 1987-11-03 | Rca Corporation | Light box having a Fresnel lens |
| US4737896A (en)* | 1985-07-23 | 1988-04-12 | Canon Kabushiki Kaisha | Illumination device |
| US4766498A (en)* | 1986-11-24 | 1988-08-23 | U.S. Philips Corporation | Image projection system |
| US4822144A (en)* | 1986-12-24 | 1989-04-18 | U.S. Philips Corporation | Electro-optic color display including luminescent layer and interference filter |
| US4870484A (en)* | 1983-05-13 | 1989-09-26 | Seiko Epson Corporation | Color display device using light shutter and color filters |
| US4882617A (en)* | 1986-12-24 | 1989-11-21 | U.S. Philips Corporation | Projection device and associated electro-optic monochrome display device with phosphor layer and interference filters |
| US4976514A (en)* | 1988-08-03 | 1990-12-11 | Pioneer Electronic Corporation | Liquid crystal display device |
| US5058997A (en)* | 1989-08-11 | 1991-10-22 | International Business Machines Corporation | Tft lcd with optical interference color filters |
| US5135300A (en)* | 1990-02-01 | 1992-08-04 | Mitsubishi Denki Kabushiki Kaisha | Projection color display apparatus |
| US5248518A (en)* | 1989-06-27 | 1993-09-28 | Mitsubishi Denki Kabushiki Kaisha | Projection cathode ray tube |
| US5248917A (en)* | 1990-07-31 | 1993-09-28 | Sanyo Electric Co., Ltd. | Flat fluorescent lamp and liquid crystal projector incorporating same |
| US5296951A (en)* | 1991-02-23 | 1994-03-22 | Smiths Industries Public Limited Company | Multicolor display apparatus employing superposed planar discharge lamps |
| US5315418A (en)* | 1992-06-17 | 1994-05-24 | Xerox Corporation | Two path liquid crystal light valve color display with light coupling lens array disposed along the red-green light path |
- 1993
- 1993-02-01JPJP5014859Apatent/JPH06242441A/enactivePending
- 1996
- 1996-03-01USUS08/609,213patent/US6147723A/ennot_activeExpired - Fee Related
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3736047A (en)* | 1971-08-13 | 1973-05-29 | Optical Coating Laboratory Inc | Liquid crystal display device with internal anti-reflection casting |
| US4870484A (en)* | 1983-05-13 | 1989-09-26 | Seiko Epson Corporation | Color display device using light shutter and color filters |
| US4737896A (en)* | 1985-07-23 | 1988-04-12 | Canon Kabushiki Kaisha | Illumination device |
| US4704004A (en)* | 1986-01-02 | 1987-11-03 | Rca Corporation | Light box having a Fresnel lens |
| US4766498A (en)* | 1986-11-24 | 1988-08-23 | U.S. Philips Corporation | Image projection system |
| US4882617A (en)* | 1986-12-24 | 1989-11-21 | U.S. Philips Corporation | Projection device and associated electro-optic monochrome display device with phosphor layer and interference filters |
| US4822144A (en)* | 1986-12-24 | 1989-04-18 | U.S. Philips Corporation | Electro-optic color display including luminescent layer and interference filter |
| US4976514A (en)* | 1988-08-03 | 1990-12-11 | Pioneer Electronic Corporation | Liquid crystal display device |
| US5248518A (en)* | 1989-06-27 | 1993-09-28 | Mitsubishi Denki Kabushiki Kaisha | Projection cathode ray tube |
| US5058997A (en)* | 1989-08-11 | 1991-10-22 | International Business Machines Corporation | Tft lcd with optical interference color filters |
| US5135300A (en)* | 1990-02-01 | 1992-08-04 | Mitsubishi Denki Kabushiki Kaisha | Projection color display apparatus |
| US5248917A (en)* | 1990-07-31 | 1993-09-28 | Sanyo Electric Co., Ltd. | Flat fluorescent lamp and liquid crystal projector incorporating same |
| US5296951A (en)* | 1991-02-23 | 1994-03-22 | Smiths Industries Public Limited Company | Multicolor display apparatus employing superposed planar discharge lamps |
| US5315418A (en)* | 1992-06-17 | 1994-05-24 | Xerox Corporation | Two path liquid crystal light valve color display with light coupling lens array disposed along the red-green light path |
Non-Patent Citations (2)
| Title |
|---|
| Born et al., "Principles of Optics", p. 285, 1970. |
| Born et al., Principles of Optics , p. 285, 1970.* |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020130786A1 (en)* | 2001-01-16 | 2002-09-19 | Visteon Global Technologies,Inc. | Series led backlight control circuit |
| US6697130B2 (en) | 2001-01-16 | 2004-02-24 | Visteon Global Technologies, Inc. | Flexible led backlighting circuit |
| US6717559B2 (en) | 2001-01-16 | 2004-04-06 | Visteon Global Technologies, Inc. | Temperature compensated parallel LED drive circuit |
| US6930737B2 (en) | 2001-01-16 | 2005-08-16 | Visteon Global Technologies, Inc. | LED backlighting system |
| US20050185113A1 (en)* | 2001-01-16 | 2005-08-25 | Visteon Global Technologies, Inc. | LED backlighting system |
| US7193248B2 (en) | 2001-01-16 | 2007-03-20 | Visteon Global Technologies, Inc. | LED backlighting system |
| US7262752B2 (en) | 2001-01-16 | 2007-08-28 | Visteon Global Technologies, Inc. | Series led backlight control circuit |
| US20080064131A1 (en)* | 2006-09-12 | 2008-03-13 | Mutual-Tek Industries Co., Ltd. | Light emitting apparatus and method for the same |
| US20100276718A1 (en)* | 2006-09-12 | 2010-11-04 | Mutual-Tek Industries Co., Ltd. | Light emitting apparatus and method for the same |
| US8110840B2 (en) | 2006-09-12 | 2012-02-07 | Mutual-Tek Undustries Co., Ltd. | Light emitting apparatus and method for the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06242441A (en) | 1994-09-02 |
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